Super Antenna

[Neo-X]

Hellow 2 all... I have a picture here of what i call super antenna. The idea is to capture the existing radio wave around us efficiently using a rectangular loop of wire instead of very long straight wire. In figure A, the veritical wire A and B have a distance separation of 1/2 of the radio wave lenght that will be going to recieved. That way maximum voltage will induced to the coil. In figure B the polarity of the induced voltage are reversed when the radio wave are also reversed. In figure C, weak voltage are being induced in wire A and B if the radiowave's wavelenght is larger than the distance of separation of wire A and B. In figure D, in order to increase the induced voltage, more loop of wire are added. Figure E - Since any coil has inductance,  a capacitor must be added in series with the coil to tune it in resonance. Figure F - If the natural capacitance of the wire is large, single wire can be used with grounding. Capacitor is still needed for fine tuning.

The advantage of this over a regular antenna is its higher voltage output and simplicity. The disadvantage is it only efficient on a single radio wave frequency.

[Neo-X]

Images

[conradelektro]

@Neo-x:

What you propose has a lot to do with the called "loop antenna" http://en.wikipedia.org/wiki/Loop_antenna which was extensively use by radio amateurs and also as free standing "room antenna" for radios and TVs when the transmitter was not too far away (e.g. in big cities). Nowadays most people have cable TV, so one does not see the loop antennas very often. The cell phones have a loop antenna running around its circumference. (Remember the loop antenna problem of the iPhone 4 which did not work when held in a certain way.)

I guess you want to harvest energy from the radio transmissions around us (Radio, TV, cell phones, WLANs, 50 Hz or 45 Hz hum from the mains 110V or 220V AC net). This needs a "broadband antenna" and not an antenna tuned to a certain frequency or frequency band.

The crucial factor of "tuning" in an antenna is "geometry", in short its length. In your frame or loop antenna it is the length of the sides of the rectangle or the diameter of the loop.

So, it is pretty straight forward to design an antenna for one special frequency or for one narrow frequency band by giving it a certain length, size or shape. This is solved and there exist many antenna designs doing the job quite well.

But for "energy harvesting" it is not clear how the antenna should look in order to catch a wide range of frequencies in a way that all frequencies are received in an optimal way.

Greetings, Conrad

[Neo-X]

Hi Conrad

I know the loop antenna its was used to recieve multiple frequecies but its was not too effiecient. Another factor is they use circular coil instead of rectangular coil.

[conradelektro]

Hi Conrad

I know the loop antenna its was used to recieve multiple frequecies but its was not too effiecient. Another factor is they use circular coil instead of rectangular coil.

Even if your rectangular Antenna is very good, how do you overcome its narrow frequency range?

Or do you want to receive only the transmissions from one transmitter sending at a specific frequency?

Greetings, Conrad